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-' of water at a temperature of 50 centigrade.

NITED STATES PATENT OFFIcEt JAMES H. STEBBI'NS, JPn., OF NEW,YORK, N. Y.

Manor/towns OF BLUE GO-LORING-QMATLI'ER.

SPECIFICATION forming part of Letters Patent No. 252,274, dated January10, 1 8 2.

Application filed November 23,1881. (Specimens) To all whom'it mayconcern:

Be it known that, I, JAMES H. STEBBINS, J r., a citizen of the UnitedStates, residing at New York, in the eountyand State of New York, haveinvented new and useful Improvements in the Manufacture of BlueColoring-Matter, of which the following is a specification.

This invention relates to a blue dyestutt' or coloring-matter, which isproduced by the action of a para-amido diinethylaniline hydrochlorateupon an alkaline solution of the soda saltof alphanaphthol sulpho-acith-In carrying out my invention I take ten pounds ofnitroso-dimethylaniline hydrochlorate and dissolve it in one thousandpounds To this solution I add ten poupds of zinc dust andinaintain thetemperature at centigrade till the solution is entirely de'colorized,which is a sign that the para-amido dimethylaniline hydrochiorate iscompletely formed. I then filter to separate from it'the zinc-d ust andallow it to cool. When cold I add th'ereto, under constant stirring, asolution composed of fifteen pounds of the soda salt ofalphanaphthoisulpho-acid, tenpcunds of caustic l soda, ten pounds ofbichromate of potash, and two hundred pounds of water. As soon as thesolutions are thoroughly mixed I add thereto sutficient common aceticacid to render the mixture slightly. acid. The bluecoloring-matteristhusimmediatelyformed,which, alter standing a shorttime, separates out as a blue precipitate, which maybe collected on afilter.

My (lye-stud, when dry, appears as a dark precipitate. An aqueousalkaline solution turns into an amber yellow when treated withgrape-sugar when heated at about 80? centigrade, which, when treatedwith ammoniacal sulphate of coppenturns blue. When an aque- -oussolution is treated with zinc-dust at a tem- What I claim as new, anddesire to secure by LettersPa-tent, is,-

A coloring-matter or dye-stuff produced by the action of the soda saltofmonosulpho-acid of alpha-naphthol on para-amido ditnethylanilinehydrochlorate, substantially as set forth. In testimony whereof I havehereunto set my hand and seal in the, presence of two sub scribing,witnesses.

JAMES H. Witnesses:

W. HAUFF, E. F. KASTENIIUBER.

STEBBISS, JR. it. s

